>possible_transfer_amounts = list(5,10,15,25,30,50,100,500) 
>500
nope nope nope
This makes extremely huge foam spills possible to the point where it can severely lag servers. pete and me balanced the foam values a long while ago with a maximum transfer of 100 in mind.
Also makes for far too strong potassium/water explosions probably rendering nitroglycerin worthless.